Hammer



FIG. 1 is an isometric view of a rear, top, and first side of an ornamental design for a hammer;

FIG. 2 is an elevational view of the first side of the hammer of FIG. 1;

FIG. 3 is an elevational view of a second side of the hammer of FIG. 1;

FIG. 4 is a rear elevational view of the hammer of FIG. 1;

FIG. 5 is a front elevational view of the hammer of FIG. 1;

FIG. 6 is a top plan view of the hammer of FIG. 1; and,

FIG. 7 is a bottom plan view of the hammer of FIG. 1.

The broken lines depict portions of the hammer in which the design is embodied that are not considered part of the claimed design. 

CLAIM The ornamental design for a hammer, as shown and described. 